Benefits of a Collagen Facial - Collagen is known in science as the main structural protein in connective tissue. In fact, it comprises approximately 25 to 35 percent of the body’s total protein content. The rate at which your body creates collagen decreases as you get older, so it isn’t surprising that collagen has been used for all sorts of anti-aging, beauty or skin care products. Here are the main benefits of getting a collagen facial.